Machine tool transmission and control



May 28, 1935. w- K. ANDREW ET AL 2,002,728

I MACHINE TOOL TRANSMISSION AND CONTROL Filed June 8, 1931 3Sheets-Sheet l I .lNyENTo L! ATT RNEY May 28, 1935. w K. ANDREW Er AL2,002,728

MACHINE TOOL TRANSMISSION AND CONTROL Filed June 8, 1931 3 Sheets-Sheet2 F'IG. 2

FIG. 4

A MQY May 28, 1935. w. K. ANDREW Er AL 2,002,728

MACHINE 'IOOL TRANSMISSION ,AND CONTROL Filed June 8, 1951 5Sheets-Sheet 3 www) gras FIG. 6

JCMQW Patented May 2.8, 1935 PATENT OFFICE- i MnoHnvE i 'rooL4TRANSMISSION ANDA CONTROL William K. Andrew and Joseph B. Armitage, -IWauwatosa, `Wis., assignors to Kearney & Trecker Corporation, WestAllis, Wis., a corporation of nWisconsin Appiication l.nine s, 192.1,serial No. `542,758

. s c1aims..,.f o1. 90-10) This invention relates to machine toolsaiidparticularly to milling machines.

An object of the inventionis to provideamill-"IV ing machine capable ofsubstantially independent operation upon a plurality of Work pieceswhile combinedly utilizing certain transmission or sup`-A port portions.Y

A further object is to provide such a machine having a plurality ofAreciprocable work tables operable on a single slide together withimproved transmission and controlmechanism therefor.

Other objects are generally to improve and simplify the construction andoperation of milling machines and still other objects will be apparentfrom the specification.

The invention consists in the construction and combination ofv parts asherein illustrated,` described, and claimed and in such modificationsasmay be equivalent to the structures claimed.

`In the drawings:

Fig. 1 is a right side elevation of a milling ma` chine partly insection along the line' I--I of Fig.' 2 incorporating the invention.

Fig. 2 is a front elevation of the samemaehine.

Fig. 3 is a. section on the line 3-3 of Fig. 1.

Fig. 4 is a section on the line 4-4 of Fig. 2.

Fig. 5 is a development of one of the table operating cams.

Fig. 6 is a'section on the line 6--8 of Fig; 2.

Fig. 7 is a sectionvon the line 1-1 of Fig. 6.

Like reference nLunerals indicate the same parts throughout thespecification and drawings As shown'in Figs. 1 and 2, the machinecomprises a'base or support I, supporting a headV frame or support 2slidable on the base and supporting rotatable spindles 3 and 4.VOverarms 5 and 6 are slidable in head frame 2 and adapted to support apendant 1 which provides a bearing for the outer ends of tool arborsBand 9 xed with tool spindles 3 and 4 and, 'carrying cutters I 0 and II.Work support tables I2 and I3 are reciprocably supported on base I inposition to cooperate with spindles 3 and 4. A pulley I4 constitutes apower source for the machine and is connected to actuate the spindlesand tables through mechanism to beV described presently. Head frame 2may be movedon base I by means of a screw I5 fixed against axialmovement rela-5 tive to base I and engaging a nut portion I 6 Spindles 3and 4 are journaledin carriers or iquius 20 and 2|, Figs. 1 and 4, andexea against axial movement relative thereto. Carriers 20, 2I areslidable'in bores such as 22, Fig. 4, formed in headY frame 2 andmayeach be adjusted in the axial' direction of the spindles by means ofscrews 23 and'24, Figs; 2, 4, each fixed against axialmovement andengaging nut portions such as 25, Fig. 4, fixed with the carriers 20 and2|. Slots 26, 21 are formed in head frame 2 intersecting theA carrierVbores Awhereby `a portion of the bores may be contracted by means ofbolts 28, 29 for clamping the'carriers in adjusted position. ,l

Overarms 5 and 6 are slidably adjustable in bores 30, 3l, Fig. 3, in thehead frame and may be clamped in adjusted position by means of clampingmembers 32, 33 pressed against over- Y arms 5 and 6 by means of bolts 34and 35 as shown inV Fig. 1, the members 32, 33 being raised by springssuch as 36, 31, Fig. 3, when bolts 34 and 35 are loosened;

Tables I2 and I3 are supported for reciprocation on a single slideformed on base I and generally denoted as 38, Fig. 1, the tables beingindependently reciprocable at different ends of the slide adjacent thedifferent spindles, but in the same path of longitudinal movement.

` Mechanism for driving spindles 3 and 4 from pulley I4 is as follows:Pulley I4 is fixed With a shaft 39, Fig. 1, rotatably supported from bedI. Shaft 39 may drive a vertical shaft 48 through a clutch devicegenerally denoted by numeral 4I, a reverser generally denoted as 42, anda rate changer generally denoted as 43. Vertical shaft 40 is connectedto drive each of the spindles through bevel Vgears 44, 45, shaft 46,and'a gear 41 meshing with a gear 48 fixed on one of the spindles and inturn meshing With a gear 49, Fig. 2, fixed'V on the other spindle. Theaxial movement ofthe spindles is relatively slight and is provided forby relative axial movement between gears 41, 48, and 49.

Transmission mechanism `for movement of tables I2, I3 from pulley I4 isas follows; A feed rate shaft 50, Figs. 1, 2, 6, and a quick traverserate shaft 5I, Figs. 1, 6, are each ex" tended longitudinally of bed Iunderneath tables I2, I3 and parallel to the reciprocatory movementthereof.

Feed shaft 5B may be driven at any of a variety of feed rates, but onlywhen clutch 4I is engaged to'drive -.the toolspindles, through a feedtrain including a gear 52 fixed on shaft 53, Figs. 1, 2, and driving agear 54 xed on a shaft 55 through an idler 58, a shaft 51 driven fromshaft an idler 55, a gear 8l, a bevel gear 88 fixed 55 through a ratechanger generally denoted as 58, Fig. 1, and which consists of suitablysupported removably interchangeable gears 59, 65, 5|, 52, the shaft 5lin turn driving the shaft 5|! through a worm |53, Figs. 1, 2, a wormwheel E@ meshed therewith, a gear 65 fixed with worm wheel 6ft, Fig. 2,and a gear 55 xed with shaft 5l! and meshingwith gear 55.

Quick traverse'shaft 5| is driven from pulley l irrespective of theposition of clutch 4| through a quick traverse train including abevelgear 61, Fig. l, fixed on the extended endn of shaft 39 and meshingwith a bevel gear G8, Fig'.y 2, fixed with a gear 69 meshing with a gearl0 fixed with a gear 1| which in turn meshes with a gear l2, Fig. 1,which is fixed on shaft 5|.

The shafts 55, 5| drive tables 2, i3 through transmission and controlmechanism selective of feed or quick traverse rates. Such mechanism isgenerally denoted at le, Fig. 2, for table. -|2and as l., Fig. 2, fortable |3. The mechanism 13, 'I is exactly similar, except reversed inrelative positions, and will, therefore, be described in detail only forthe table l2, as follows: *Underneath table |2 is a rotatablecylindrical cam' member l5, Fig. 2, having its axis parallel with thepath of movement of the table and 'connected for table movement by themeans of a follower member le `iixed'underneath the table and engaging aperipheral cam slot having a developed form as shown in Fig. 5,. A wormwheel il, Fig. 2, fixed with cam 'l5 engages a worm i8, Figs. 2, 6,which may be driven eitherv from shaft 55, through a train including agear 79, Figs. 2, 6, xed on shaft 55, an idler 8U, a gear 8|, Va bevelgear 82 fixed with gear 8|, a bevel gear 83 meshing with gear 32 and aterminal feed clutch member 35i xed with 'bevel gear 82; or may bedriven from shaft 5| through a similar train including a gear 35, Fig.6, fixed on shaft 95 engaging suitable annular grooves in the respectivemembers and both fixed on a shi'ftable rod 9G. The arrangement is suchthat engaging the one clutch member disengages the other.

For controlling the table transmission just rde-V scribed there isprovided the following mechanism. Dogs Si, 98, 99, Figs. 6, 7, areadjustably iixed against the end face |95 of cam l5 by the means ofT-slots lill or m2, there being screws |533, lfl, H35, etc., engagingsuitable elements, not shown, in the T-slots. There is also providedtrip mechanism connected with the rod 96 for control thereof as follows:A lever 55, Figs.,6, 7, is fixed on a shaft lill and a pin |58 fixedwith the lever engages a suitable slot H39 in the rod. Also fixed withshaft ii isa lever carrying a pin l having a lostmotion engagement witha slot H2 in a lever arm H3 fixed on'a shaft H4. Another lever arm 5fixed with arm I3 carries a plunger H5 slidable to right or left in Fig.7 whereby a portion or end il? thereof may be set forward into the pathof dogs el', 98, 99, or withdrawn from such path. Plunger l l5 isnormally pressed to the right, Fig. 7, for the portion ||l to be in thepath of dog movementby the means of a spring H6, but may be manuallymoved tol the left as follows: Shaft 4 carries fixed thereon a lever H9having a lever handle portion |25 pivoted at |2| in a manner permittingoperation against a portion |22 fixed with plunger ||5 whereby movementof lever handle |2 to the dotted line position of Fig. 7 withdrawsplunger H5 to the left. Handle lever |25 is alsol operable through leverH9 to manually oscillate the shaft H. A load and nre or snap-overmechanism of conventional form is associated with shaft 4,

consisting of a cam or detent 523 fixed with the shaft il!!v and engagedby a spring pressed Ythe point of cam |23 to move past the point |25 ofthe plunger before the clutch members 9| or 92, as the case may be, aredisengaged from the terminal clutchelements 84 or 98. Thereafter, upondisengagement the cam and plunger will continue the clutch movement intoopposite engagement irrespectiveof the dogs, unless prevented, as laterdescribed.

in the position of parts shown Ain Fig. 6 the table cam l5 is drivenfrom feed terminal element 8 and is therefore travelling at a slow rate.Either terminal element drives the cam 'I5 in the direction of thearrow, Fig. 6, and in the course of subsequent cam rotation the dog 93engages the trip portion il to move lever arm H5 to the right todisengage clutch member 9|, the movement being then completed by thesnapover device to engage the clutch 92 whereby to speed the cam 'l5 upto a quick traverse rate.

The relationship of the parts is such that at the time of the beginningof the feed movement just described the cam follower l5 is positioned inthe cam groove |25, Fig. 5, at approximately the point |21 thereof.During the feed movement just described the cam will have moved in thedirection of the arrow, Figs. 5, 6, to position the follower atapproximately the point |28 having in the interval traversed the camVgroove portion |29 having relatively small rise and operating to movetable l2 through the last portion of its movement toward the cutter,that is tosay, to the left in Fig. 2.

At the time of the clutch shift, just described, to engage the quicktraverse cam movement, the follower 'i5 is entering that portion of thecam groove shown at |35 which starts table l2 in the other direction orto the right in Fig. 2 at a fast rate, both Yby reason of the increasedspeed of cam 'l5 and also by reason of the increased angle of the camgroove. This rap-id cam and table movement continues throughout theright-hand table movement. At the completion of the right-v handmovement it is ordinarily desired Vto sto-p the table for removal andreplacement of work pieces. This is effected by the dog 97|, whichengages the trip portion forcing4 lever H5 to the left in Fig. 6, todisengage clutch member 92. In this instance, however, the snap-overmechanism is prevented from immediately engaging the other clutch memberas follows:

A portion of the end periphery of cam l5 is out away as at t3 17Figs. 6,7, over a substantial arc. A lever |32, Figs. 6, 7, fixed.- with shaft|57 has aportion E33 movable into the space provided by the cut-awayportion to permit shaft |01 to move to engage clutch member 9|, butprevented from so moving if the cam 'l5 stands in positions where thecut-away portion does not coincide with the lever portion |32. Such isthe cam position when the dogm'l is operative and the snapvsnap-overdevice shifts clutch member 9| into overcannot, therefore, engage the;feed clutch and the table will stop. When the: operator has completedtherloading, the table is againstarted. This is done by pullinghand-lever |201to the left in Fig. 7 whereby to disengage trip elementfrom dog 9], after which the lever is moved toturn shaft H4, Fig. 6,whereby to reengage clutch 92. The cam follower 'I6 is then at the point|36, Fig. 5, of the cam groove and in the subsequent movement traversesthe portion |35 of the cam groove, operating the table I2 to the left,Fig. 2, at a fast rate partly by reason of the fast cam movement andpartly by reason of the rapid rise in that portion of the cam groove.

In the next subsequent movement dog 99 is operative. This dog, similarto dog 91, shifts the trip portion toi the left in Fig. 6, but in thisinstance the lever portion |33 is free to move into the cut-away portion|3| of cam I5 whereby the engagement for a feed rate of cam 15. Thecycle of movement previously described is then repeated.

It will be noted that dog 99 is extended over a considerable arc. Thisis to prevent accidental manual movement of lever |20 in a direction toengage the rapid traverse rate of cam while .i the cutter is operatingon the work piece.

The above is descriptive of the transmission and control mechanismgenerally denoted as 13, Fig. 2, and the operation thereof for table l2.There is, as previously noted, a similar transmission and controlmechanism 14, Fig. 2, for table I3 and the operation thereof is similarin all respects.

Since the control mechanisms of the different tables are completelyindependent in operation, different operations may be performed by thediiferent tables. Also, one table may be stationary for loading whilethe other is operating. Various other advantages will also be apparent.

It may be noted that while all the cam portion |29, Fig. 5, may beadvantageously used for a feed rate of table movement, it is notnecessary to do so. If the quick traverse clutch is engaged to drive caml5, the resulting rate, even during this portion, is on the order of arapid traverse. Very short feed movements may therefore readily beeifected by suitably positioning .the control dogs or providingdifferent dogs similar to those shown.

What is claimed is:

1. In a milling machine, the combination of a rst work support table, asupport providing a guideway for reciprocatory movement of said table,said guideway having an extended portion, a second work support tableguided in said extended portion for reciprocatory movement, a pluralityof rotatable tool spindles respectively associated with said rst andsecond work table, and transmission mechanism for movement of saidtables including for each table means individually selective of feed orquick traverse rates of table movement, whereby either table may beoperated at either rate irrespective of the rate at which the othertable is operative.

2. In a milling machine, the combination of a iirst work support table,a support providing a guideway for reciprocatory movement of said table,said guideway having an extended portion, a second work support tableguided in said eX- tended portion for reciprocatory movement, aplurality of rotatable tool spindles respectively associated with saidrst and second work table,

transmission mechanism for' rotation'f'of said spindles4 includingshiftable motion interrupting means common '.to both spindles, and afeed vrate transmission mechanism for movement of each of` said tablesat a cutting rate and driven throughsaid motion interrupting means,whereby each of. said tables is inoperative at a feed rate whenever therotation of said spindles is interrupted.

3. In a milling machine, the combination of an extended table guideway aplurality of work tables respectively reciprocable at opposite ends ofsaid guideway, a plurality of rotatable tool spindles respectivelyassociated with different of said tables, a power source, transmissionmechanism for rotation of each of said spindles from said power source,table transmission mechanism for reciprocation of each of said tablesfrom said power source including for each table means associatedtherewith and individually shiftable to alternatively select feed orrapid traverse rates of movement of the table with which it isassociated, and control mechanism for said table transmission includingfor each table a trip mechanism individual thereto for shifting saidshiftable means in accordance with the movement of the table with whichit is associated.

4. In a milling machine, the combination of a base, a table guidewaysupported from said base, a plurality of work tables each reciprocablyguided in said guideway and spaced apart in the direction of saidreciprocation, transmission mechanism for movement of said tablesincluding a plurality of rotatable elements each supported from saidbase and respectively underlying the different tables in axialparallelism with said directionV of reciprocation, and including aplurality of shiftable devices respectively associated with thedifferent tables and individually determinative of feed or quicktraverse rates of the different elements, and control mechanism for saidtransmission mechanism including a plurality of trip mechanismsrespectively associated with the different tables for operation inaccordance with movement thereof and each operable for shifting the oneof said devices which is associated with the same table, and means foreach table individually selective of feed or quick traverse rates oftable movement.

5. In a milling machine, the combination of a support, a plurality ofwork tables each supported from said support for reciprocatory movementin directions toward and from one another, a plurality of rotatable toolspindles respectively associated with the different tables, transmissionmechanism for rotation of said spindles, transmission mechanism for saidtables including a portion individual to one of said tables, a shiftabledevice determinative of feed or quick traverse rate of said portion, anda trip device associated with the last mentioned table and operable inaccordance with the movement thereof for shifting said shiftable device.

6. In a milling machine, the combination of a support, a plurality ofwork tables each supported from said support for reciprocatory movementin a direction toward and from the other table, a plurality of rotatabletool spindles respectively associated with dierent of said tables,transmission mechanism for rotation of said spindles including means forsimultaneously interrupting rotation thereof, transmission mechanism formovement of said tables including a rate changer driven through saidmotion interrupting means,

aplura'l-ity of feed t'ermi'naleemnis driven-:from the .last mfienbbried:table yincluding a. trip device said rate changer =andVrespe'ctivelyfor Ldiffenen'i; associated therewith Yand operablethrough said of v'said tables, a quick traverse termi-nal Aelementassociated lfeed quick "tra-Verse elements in driven exclusive -of saidmotion interrupting accordance with the movement of said last menmeansandassociated With -one `of saidfeed velebio'ned f'able.

ments for individua-1 feed lor quick traverselco'n- WILLIAM K. ANDREW.trol o'f :one of said tables, and control means 'for Y JOSEPH B.ARMITAGE.

